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The synthesis, crystal structure and photophysical properties of the new compound [Mn₄(ThiaSO₂)₂F][K(18-crown-6)], ThiaSO₂ = p-tertbutylsulphonylcalix[4]arene, are presented and compared to the ones of [Mn₄(ThiaSO₂)₂F]K. The strong orange luminescence is attributed to the Mn²⁺ centred ⁴T₁ â†’ ⁶A₁ transition. Its temperature and pressure dependence and quenching by molecular dioxygen are reported. The latter is attributed to energy transfer from the ⁴T₁ state exciting dioxygen to its ¹Î£⁺_g state. In the solid state, the quenching is much more efficient in [Mn₄(ThiaSO₂)₂F][K(18-crown-6)] than in [Mn₄(ThiaSO₂)₂F]K. This is attributed to the open pore structure of the former allowing fast diffusion of dioxygen into the crystal lattice.

Discrete polynuclear manganese(II) complexes with thiacalixarene ligands: synthesis, structures and photophysical properties Y. Suffren, N. O'Toole, A. Hauser, E. Jeanneau, A. Brioude and C. Desroches Dalton Transactions, 44 (17) (2015), p7991-8000 DOI:10.1039/C5DT00827A \| unige:72656 \| Abstract \| Article HTML \| Article PDF \| Supporting Info
The synthesis, crystal structure and photophysical properties of the new compound [Mn₄(ThiaSO₂)₂F][K(18-crown-6)], ThiaSO₂ = p-tertbutylsulphonylcalix[4]arene, are presented and compared to the ones of [Mn₄(ThiaSO₂)₂F]K. The strong orange luminescence is attributed to the Mn²⁺ centred ⁴T₁ â†’ ⁶A₁ transition. Its temperature and pressure dependence and quenching by molecular dioxygen are reported. The latter is attributed to energy transfer from the ⁴T₁ state exciting dioxygen to its ¹Î£⁺_g state. In the solid state, the quenching is much more efficient in [Mn₄(ThiaSO₂)₂F][K(18-crown-6)] than in [Mn₄(ThiaSO₂)₂F]K. This is attributed to the open pore structure of the former allowing fast diffusion of dioxygen into the crystal lattice.

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